If you sell 40m consoles in a cycle, and an xbox controller costs about $60, so lets assume $20 profit to MSFT and you sell an average of 1.5 extra controllers

If you sell 40m consoles in a cycle, and an xbox controller costs about $60, so lets assume $20 profit to MSFT and you sell an average of 1.5 extra controllers per console sale.. that is $1.2b of profit at stake over the course of the total console cycle. That's over something like five years and they probably get a lot of those profits anyway. But it's not nothing! I a hundred million dollars of profit per year a big deal to MSFT? No of course not. But imagine you are in charge of the peripherals division, or even all of XBox. Then I think it is not unrealistic.